Weighted harmonic average

Ten workers will do some work in 2 minutes, five workers in 10 minutes and three workers in 6 minutes. How many minutes per average worker per worker?

Correct answer:

r =  3 min

Step-by-step explanation:

w1=10 w2=5 w3=3 t1=2 min t2=10 min t3=6 min  r=w1+w2+w3w1 1t1+w2 1t2+w3 1t3=10+5+310 12+5 110+3 16=3 min

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